(A) : Average oxidation number of chlorine in bleaching powder is zero.
(R) : Oxidation number of chlorine is always zero.

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A is false but R is true

A is true but R is false

Both A and R are true and R is the correct explanation

Both A and R are true but R is not the correct explanation of A

answer is C.

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Detailed Solution

In bleaching powder, Ca(OCl)Cl, the two Cl atoms are in different oxidation states i.e., one Cl– having oxidation number of –1 and the other as OCl– having oxidation number of +1.

Hence, the average oxidation state of chlorine in bleaching powder is zero but it is not means that always Cl has zero oxidation state.

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